package com.hmdp.service.impl;

import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import com.hmdp.dto.Result;
import com.hmdp.entity.ShopType;
import com.hmdp.mapper.ShopTypeMapper;
import com.hmdp.service.IShopTypeService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.RedisConstants;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.List;
import java.util.concurrent.TimeUnit;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author DJ
 * @since 2021-12-22
 */
@Service
public class ShopTypeServiceImpl extends ServiceImpl<ShopTypeMapper, ShopType> implements IShopTypeService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result<List<ShopType>> queryTypeList() {
        // 从Redis查询商铺类型信息
        String shopTypeJson = stringRedisTemplate.opsForValue().get(RedisConstants.CACHE_SHOP_TYPE_KEY);
        // 判断缓存是否存在
        if (StrUtil.isNotBlank(shopTypeJson)) {
            // 存在，直接返回
            return Result.ok(JSONUtil.toList(shopTypeJson, ShopType.class));
        }
        // 不存在,查询数据库
        List<ShopType> typeList = this.query().orderByAsc("sort").list();
        // 写入缓存
        stringRedisTemplate.opsForValue().set(RedisConstants.CACHE_SHOP_TYPE_KEY, JSONUtil.toJsonStr(typeList));
        // 设置缓存失效时间
        stringRedisTemplate.expire(RedisConstants.CACHE_SHOP_TYPE_KEY, RedisConstants.CACHE_SHOP_TYPE_TTL, TimeUnit.HOURS);
        // 返回
        return Result.ok(typeList);
    }
}
